This paper also discusses specially a two-part pricing mechanism based on the long-term marginal cost principle. The detailed design method for the pricing system is provided.

其中详细探讨了一种基于长期边际成本原理设计的两部制电价结构体系，给出了这一价格体系设计的具体方法和过程。

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Based on the concept of load-price elasticity, the principle of marginal cost pricing, and conditions of the deregulated retail electricity market, the model of spot pricing was deduced.

根据电力零售市场的特点，基于负荷价格响应的定义以及边际成本定价理论，推导出了考虑负荷价格响应的有功实时电价的表达式。

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Namely second is the marginal nature principle, select as far as possible at the edge of Central Plains like Xi 'an, Beijing and Nanjing etc ground as the capital.

第二是边缘性原则，即尽可能地选择在中原的边缘地带如西安、北京、南京等地作为都城。

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Mr Romney talks about "fairness" and "bringing down" marginal rates, but not about eliminating the principle.

BBC: Is redistribution a foreign idea to the US?

The wonderful, work-based, affluence-inducing, effects of low marginal tax rates is not the only fundamental economic principle that Ibn Khaldun got right.

FORBES: Ronald Reagan, Ibn Khaldun, Mahathir Mohamad: Back to Capitalist Basics